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Photovoltaic direct-current micro-grid energy coordination control method

A technology of DC microgrid and control method, applied in photovoltaic power generation, current collectors, electric vehicles, etc., to achieve the effects of reliable operation, energy saving and energy loss reduction

Active Publication Date: 2014-01-29
STATE GRID CORP OF CHINA +1
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Problems solved by technology

So far, there is no ideal control method for photovoltaic DC microgrid, which can not only ensure the stability of the DC bus voltage at a constant voltage state, but also realize the current output of the system, so that the energy supply system can be well matched with the load, saving energy. consumption, and reliable operation

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experiment example

[0032] Based on the photovoltaic DC microgrid energy coordination control method of the present invention, the inventor built a system experiment platform, and the experiment conditions are as follows:

[0033] 1) Grid-connected mode experiment

[0034] When the system starts, the photovoltaic array 1 does not work, the bidirectional Boost / Buck converters 7 and 8 work in the rectification mode, stabilize the bus voltage, and supply energy to the DC load 3, and the three-phase full-bridge inverter 10 works in the rectification mode, DC voltage U dc The stable value is 350V, the load voltage U l The steady-state value of 150V, the transformer secondary side A-phase current I as The peak value is about 3.9A, and the power factor of the large grid side is close to the unit power factor, which is in line with the expected effect;

[0035] 2) Island mode experiment

[0036] When the three-phase full-bridge inverter 10 is disconnected, the photovoltaic DC microgrid operates in...

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Abstract

The invention discloses a photovoltaic direct-current micro-grid energy coordination control method. According to the control method, a master-slave parallel method and a direct-current bus voltage droop method are combined; in a grid connection mode, the master-slave parallel method is adopted, and a large-scale grid interface circuit maintains energy balance in a micro-grid and stabilizes direct-current bus voltage in the micro-grid; in an island mode, the direct-current bus voltage droop method is adopted for control, an interface circuit adjusts running modes of a photovoltaic array and an accumulator battery aiming for different states of the direct-current bus voltage. Therefore, effective control on output current is realized, energy balance of the micro-grid is maintained so as to ensure the direct-current bus voltage to be stabilized in a constant-voltage state, equal-current output of a system is realized, the direct-current micro-grid and the large-scale grid are combined organically, an energy supply system and a load are enabled to be well matched, reliable running of the system is guaranteed, energy loss can be effectively reduced, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power, in particular to an energy coordination control method for a photovoltaic DC microgrid. Background technique [0002] Under the dual pressure of environmental pollution and energy crisis, solar power generation technology has become a research hotspot in the power electronics industry. Driven by power electronics technology and energy storage technology, DC microgrid will develop rapidly. With its advantages of easy control, high reliability, and low loss, DC microgrid will become the main power supply structure for remote mountain villages and future families. [0003] A DC microgrid is characterized by coordinated control among distributed power sources, energy storage devices, and loads. However, the existing coordinated control technology mostly adopts the master-slave parallel connection method or the bus voltage droop method. The master-slave parallel connection method must in...

Claims

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Application Information

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IPC IPC(8): H02J7/34
CPCY02E10/56
Inventor 张富洲陈莎张雪煜王修庞郭旭李吉浩于晶荣李冬雪罗道军薛冰
Owner STATE GRID CORP OF CHINA
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